Shoieb, Farouk Tammam Ali. “Sociodemographic Influences on Initial and Subsequent Childbearing: A Hazard Model Analysis.” Diss. North Carolina State U, 1985.
Data was collected in Robeson County in the summer of 1972. The sample included 526 couples, and 169 women not currently married, aged 18-49. Shoieb determined that Black and Indian women begin childbearing at a younger age and then have subsequent births at a faster pace than White women. As a result, Black and Indian women have more children and higher fertility than White women. Race and educational attainment also influence initial and subsequent childbearing.